The Geological History of PlantsK. Paul, Trench, 1888 - 290 pagini |
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Pagina 75
Sir John William Dawson. Another very remarkable fern , which some botanists have supposed may belong to a higher group than the ferns , is Megalopteris ( Fig . 26 ) . Some of the Erian ferns attained to the dimensions of tree - ferns ...
Sir John William Dawson. Another very remarkable fern , which some botanists have supposed may belong to a higher group than the ferns , is Megalopteris ( Fig . 26 ) . Some of the Erian ferns attained to the dimensions of tree - ferns ...
Pagina 76
... tree - ferns of the tropics and the southern hemisphere . In one kind of tree - fern stem from the Erian of New York , there is. 76 THE GEOLOGICAL HISTORY OF PLANTS .
... tree - ferns of the tropics and the southern hemisphere . In one kind of tree - fern stem from the Erian of New York , there is. 76 THE GEOLOGICAL HISTORY OF PLANTS .
Pagina 77
... ferns by the former , but treated as doubtful This by the latter . peculiar type of tree- fern is apparently a precursor of the more exogenous type of Heterangium , recent- ly described and re- ferred to ferns by Williamson . Here ...
... ferns by the former , but treated as doubtful This by the latter . peculiar type of tree- fern is apparently a precursor of the more exogenous type of Heterangium , recent- ly described and re- ferred to ferns by Williamson . Here ...
Pagina 90
... TREE - FERNS OF THE ERIAN PERIOD . As the fact of the occurrence of true tree - ferns in rocks so old as the Middle Erian or Devonian has been doubted in some quar- ters , the following summary is given from descriptions published in ...
... TREE - FERNS OF THE ERIAN PERIOD . As the fact of the occurrence of true tree - ferns in rocks so old as the Middle Erian or Devonian has been doubted in some quar- ters , the following summary is given from descriptions published in ...
Pagina 91
... plant found by Mr. Richardson at Perry , as possibly a species of Megaphyton , using that term to denote those stems of tree - ferns which have the leaf - scars in two vertical series ; but the specimen was obscure , and I have not yet ...
... plant found by Mr. Richardson at Perry , as possibly a species of Megaphyton , using that term to denote those stems of tree - ferns which have the leaf - scars in two vertical series ; but the specimen was obscure , and I have not yet ...
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Termeni și expresii frecvente
Acrogens aërial roots Algæ allied America appear Archæopteris arctic areoles bark beds belong bituminous branches Brongniart bundles Calamites Canada Carboniferous Caulopteris cellular character clay climate coal coal-formation cones conifers Cordaites cycads cylinder Dadoxylon Dawson Demy 8vo deposits described Devonian dicotyledonous Eocene Erian Europe exogenous Fcap ferns flora formation forms fossil plants fronds fructification fruit Gaspé genera genus Geological Society Greenland Heer hemisphere Illustrations land Laramie leaf-bases leaf-scars leaves Lepidodendron Lepidophloios Lesquereux limestone Lower Carboniferous Lycopods macrospores medullary rays Mesozoic Middle Miocene modern northern Nova Scotia occur outer Palæozoic period Permian pines pinnules pith present probably Prof Psilophyton referred resemble Rhizocarps ribbed rocks sandstones scalariform Sequoia shales Sigillaria Silurian similar Small crown 8vo species specimens Sphenophyllum Sphenopteris Sporangites spore-cases spores sporocarps stems Sternbergia structure Tertiary thick tion tissue transverse tree-ferns trees trunks types Upper Cretaceous vascular scar vegetable wood woody
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